Pneumatic Supply

Question 1

Under what condition does the XBLEED valve open with the XBLEED switch in AUTO?

Answer 1

Loss of bleed air from one engine

Question 2

Configuration: Engine 2 is started first, SAT>30C. What is the position of the following valves after both engines are running?

In the above configuration, how is fresh air supplied to the cabin?

In the above configuration, when are both PRSOV’s and FCSOV’s (ECS) forced to open?

Answer 2

-PRSOV1: CLOSED
-PRSOV2:CLOSED
-XBLEED:CLOSED

A Line from the condenser area allows ambient air to bypass the Ram Air Valve into the overhead manifold.

TOGA Power

Question 3

Configuration: Engine 2 is started first, SAT is between 11C and 30C. What is the position of the following valves after both engines are running?

In the above configuration, when is PRSOV1 forced open and XBLEED closed?

Answer 3

PRSOV1: CLOSED
PRSOV2: OPEN
XBLEED: OPEN

TOGA Power

Question 4

Configuration: Engine 2 is started first, SAT is below 8C. What is the position of the following valves after both engines are running?

Answer 4

PRSOV1: OPEN
PRSOV2: OPEN
XBLEED: Closed

Question 5

What is the cockpit indication that one or both PRSOV’s is closed?

Answer 5

-CAS (Advisory): BLEED 1(2) OFF
-ECS Synoptic Page
-Ice Protection Synoptic Page

Question 6

What is the cockpit indication of the XBLEED position?

Answer 6

-ECS Synoptic Page
-Ice Protection Synoptic Page

Question 7

Describe the position of the FCSOV (ECS) Valves with the ECS switch in BOTH?

Answer 7

Both FCSOV (ECS) valves are open.

Question 8

What occurs when the ECS switch is moved to the 1 or 2 position?

Answer 8

The selected side FCSOV (ECS) valve is open and the opposite side is closed.

Question 9

What occurs when the ECS switch is moved to the OFF VENT position?

Answer 9

-Ram Air Valve opens
-FCSOV (ECS) 1 and 2 close